right angle

noun
the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.
RELATED CONTENT
Alright vs. All RightWhat’s the difference between alright and all right? Are all right and alright interchangeable? All right has a range of meanings including: “safe,” as in “Are you all right?” “reliable; good,” as in “That fellow is all right.” as an adverb, it means “satisfactorily,” as in “His work is coming along all right” “yes,” as in “All right, I’ll go with you.” The form alright is a oneword spelling …
Does “right” actually mean “right?” Does that mean “left” means “wrong?”Little kids often get confused regarding the fact that “right” refers to a certain direction and also what is good, proper, and just. After all, “left” doesn’t mean wrong ― right? Well, not exactly. “Left” comes from the Old English lyft, which means “weak, idle, foolish.” Whereas, the Old English riht means “just, good, fair, proper, fitting, straight.” In the 13th century “left” replaced the Old …
Nearby words
 riggs' disease,
 right,
 right about,
 right about face,
 right and left,
 right as rain,
 right ascension,
 right atrioventricular valve,
 right away,
 right bank
Origin of right angle
Middle English word dating back to 1350–1400
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for right angle
right angle
noun
the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
at right angles perpendicular or perpendicularly
Collins English Dictionary  Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
right angle
[ rīt ]
An angle having a measure of 90°.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
right angle
An angle measuring ninety degrees, formed by the intersection of two perpendicular lines. (Compare acute angle and obtuse angle.)
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.